<?php

/**
 * webtrees: online genealogy
 * Copyright (C) 2019 webtrees development team
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace Fisharebest\Webtrees\Module;

use Aura\Router\RouterContainer;
use Fig\Http\Message\RequestMethodInterface;
use Fisharebest\Webtrees\Auth;
use Fisharebest\Webtrees\I18N;
use Fisharebest\Webtrees\Individual;
use Fisharebest\Webtrees\Menu;
use Fisharebest\Webtrees\Services\ChartService;
use Fisharebest\Webtrees\Webtrees;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\RequestHandlerInterface;

use function app;
use function array_keys;
use function assert;
use function implode;
use function max;
use function min;
use function redirect;
use function route;

/**
 * Class FanChartModule
 */
class FanChartModule extends AbstractModule implements ModuleChartInterface, RequestHandlerInterface
{
    use ModuleChartTrait;

    private const ROUTE_NAME = 'fan-chart';
    private const ROUTE_URL  = '/tree/{tree}/fan-chart-{style}-{generations}-{width}/{xref}';

    // Chart styles
    private const STYLE_HALF_CIRCLE          = '2';
    private const STYLE_THREE_QUARTER_CIRCLE = '3';
    private const STYLE_FULL_CIRCLE          = '4';

    // Defaults
    private const   DEFAULT_STYLE       = self::STYLE_THREE_QUARTER_CIRCLE;
    private const   DEFAULT_GENERATIONS = 4;
    private const   DEFAULT_WIDTH       = 100;
    protected const DEFAULT_PARAMETERS  = [
        'style'       => self::DEFAULT_STYLE,
        'generations' => self::DEFAULT_GENERATIONS,
        'width'       => self::DEFAULT_WIDTH,
    ];

    // Limits
    private const MINIMUM_GENERATIONS = 2;
    private const MAXIMUM_GENERATIONS = 9;
    private const MINIMUM_WIDTH       = 50;
    private const MAXIMUM_WIDTH       = 500;

    /** @var ChartService */
    private $chart_service;

    /**
     * FanChartModule constructor.
     *
     * @param ChartService $chart_service
     */
    public function __construct(ChartService $chart_service)
    {
        $this->chart_service = $chart_service;
    }

    /**
     * Initialization.
     *
     * @return void
     */
    public function boot(): void
    {
        $router_container = app(RouterContainer::class);
        assert($router_container instanceof RouterContainer);

        $router_container->getMap()
            ->get(self::ROUTE_NAME, self::ROUTE_URL, $this)
            ->allows(RequestMethodInterface::METHOD_POST)
            ->tokens([
                'generations' => '\d+',
                'style'       => implode('|', array_keys($this->styles())),
                'width'       => '\d+',
            ]);
    }

    /**
     * How should this module be identified in the control panel, etc.?
     *
     * @return string
     */
    public function title(): string
    {
        /* I18N: Name of a module/chart */
        return I18N::translate('Fan chart');
    }

    /**
     * A sentence describing what this module does.
     *
     * @return string
     */
    public function description(): string
    {
        /* I18N: Description of the “Fan Chart” module */
        return I18N::translate('A fan chart of an individual’s ancestors.');
    }

    /**
     * CSS class for the URL.
     *
     * @return string
     */
    public function chartMenuClass(): string
    {
        return 'menu-chart-fanchart';
    }

    /**
     * Return a menu item for this chart - for use in individual boxes.
     *
     * @param Individual $individual
     *
     * @return Menu|null
     */
    public function chartBoxMenu(Individual $individual): ?Menu
    {
        return $this->chartMenu($individual);
    }

    /**
     * The title for a specific instance of this chart.
     *
     * @param Individual $individual
     *
     * @return string
     */
    public function chartTitle(Individual $individual): string
    {
        /* I18N: http://en.wikipedia.org/wiki/Family_tree#Fan_chart - %s is an individual’s name */
        return I18N::translate('Fan chart of %s', $individual->fullName());
    }

    /**
     * A form to request the chart parameters.
     *
     * @param Individual $individual
     * @param mixed[]    $parameters
     *
     * @return string
     */
    public function chartUrl(Individual $individual, array $parameters = []): string
    {
        return route(self::ROUTE_NAME, [
                'xref' => $individual->xref(),
                'tree' => $individual->tree()->name(),
            ] + $parameters + self::DEFAULT_PARAMETERS);
    }

    /**
     * @param ServerRequestInterface $request
     *
     * @return ResponseInterface
     */
    public function handle(ServerRequestInterface $request): ResponseInterface
    {
        $tree        = $request->getAttribute('tree');
        $user        = $request->getAttribute('user');
        $xref        = $request->getAttribute('xref');
        $style       = $request->getAttribute('style');
        $generations = (int) $request->getAttribute('generations');
        $width       = (int) $request->getAttribute('width');
        $ajax        = $request->getQueryParams()['ajax'] ?? '';
        $individual  = Individual::getInstance($xref, $tree);

        // Convert POST requests into GET requests for pretty URLs.
        if ($request->getMethod() === RequestMethodInterface::METHOD_POST) {
            return redirect(route(self::ROUTE_NAME, [
                'tree'        => $request->getAttribute('tree')->name(),
                'xref'        => $request->getParsedBody()['xref'],
                'style'       => $request->getParsedBody()['style'],
                'generations' => $request->getParsedBody()['generations'],
                'width'       => $request->getParsedBody()['width'],
            ]));
        }

        Auth::checkIndividualAccess($individual);
        Auth::checkComponentAccess($this, 'chart', $tree, $user);

        $width = min($width, self::MAXIMUM_WIDTH);
        $width = max($width, self::MINIMUM_WIDTH);

        $generations = min($generations, self::MAXIMUM_GENERATIONS);
        $generations = max($generations, self::MINIMUM_GENERATIONS);

        if ($ajax === '1') {
            return $this->chart($individual, $style, $width, $generations);
        }

        $ajax_url = $this->chartUrl($individual, [
            'ajax'        => true,
            'generations' => $generations,
            'style'       => $style,
            'width'       => $width,
        ]);

        return $this->viewResponse('modules/fanchart/page', [
            'ajax_url'            => $ajax_url,
            'generations'         => $generations,
            'individual'          => $individual,
            'maximum_generations' => self::MAXIMUM_GENERATIONS,
            'minimum_generations' => self::MINIMUM_GENERATIONS,
            'maximum_width'       => self::MAXIMUM_WIDTH,
            'minimum_width'       => self::MINIMUM_WIDTH,
            'module'              => $this->name(),
            'style'               => $style,
            'styles'              => $this->styles(),
            'title'               => $this->chartTitle($individual),
            'tree'                => $tree,
            'width'               => $width,
        ]);
    }

    /**
     * Generate both the HTML and PNG components of the fan chart
     *
     * @param Individual $individual
     * @param string     $style
     * @param int        $width
     * @param int        $generations
     *
     * @return ResponseInterface
     */
    protected function chart(Individual $individual, string $style, int $width, int $generations): ResponseInterface
    {
        $ancestors = $this->chart_service->sosaStradonitzAncestors($individual, $generations);

        $gen  = $generations - 1;
        $sosa = 2 ** $generations - 1;

        // fan size
        $fanw = 640 * $width / 100;
        $cx   = $fanw / 2 - 1; // center x
        $cy   = $cx; // center y
        $rx   = $fanw - 1;
        $rw   = $fanw / ($gen + 1);
        $fanh = $fanw; // fan height
        if ($style === self::STYLE_HALF_CIRCLE) {
            $fanh = $fanh * ($gen + 1) / ($gen * 2);
        }
        if ($style === self::STYLE_THREE_QUARTER_CIRCLE) {
            $fanh *= 0.86;
        }
        $scale = $fanw / 640;

        // Create the image
        $image = imagecreate((int) $fanw, (int) $fanh);

        // Create colors
        $transparent = imagecolorallocate($image, 0, 0, 0);
        imagecolortransparent($image, $transparent);

        /** @var ModuleThemeInterface $theme */
        $theme = app(ModuleThemeInterface::class);

        $foreground = $this->imageColor($image, $theme->parameter('chart-font-color'));

        $backgrounds = [
            'M' => $this->imageColor($image, $theme->parameter('chart-background-m')),
            'F' => $this->imageColor($image, $theme->parameter('chart-background-f')),
            'U' => $this->imageColor($image, $theme->parameter('chart-background-u')),
        ];

        imagefilledrectangle($image, 0, 0, (int) $fanw, (int) $fanh, $transparent);

        $fandeg = 90 * $style;

        // Popup menus for each ancestor
        $html = '';

        // Areas for the imagemap
        $areas = '';

        // loop to create fan cells
        while ($gen >= 0) {
            // clean current generation area
            $deg2 = 360 + ($fandeg - 180) / 2;
            $deg1 = $deg2 - $fandeg;
            imagefilledarc($image, (int) $cx, (int) $cy, (int) $rx, (int) $rx, (int) $deg1, (int) $deg2, $backgrounds['U'], IMG_ARC_PIE);
            $rx -= 3;

            // calculate new angle
            $p2    = 2 ** $gen;
            $angle = $fandeg / $p2;
            $deg2  = 360 + ($fandeg - 180) / 2;
            $deg1  = $deg2 - $angle;
            // special case for rootid cell
            if ($gen == 0) {
                $deg1 = 90;
                $deg2 = 360 + $deg1;
            }

            // draw each cell
            while ($sosa >= $p2) {
                if ($ancestors->has($sosa)) {
                    $person  = $ancestors->get($sosa);
                    $name    = $person->fullName();
                    $addname = $person->alternateName();

                    $text = I18N::reverseText($name);
                    if ($addname) {
                        $text .= "\n" . I18N::reverseText($addname);
                    }

                    $text .= "\n" . I18N::reverseText($person->getLifeSpan());

                    $background = $backgrounds[$person->sex()];

                    imagefilledarc($image, (int) $cx, (int) $cy, (int) $rx, (int) $rx, (int) $deg1, (int) $deg2, $background, IMG_ARC_PIE);

                    // split and center text by lines
                    $wmax = (int) ($angle * 7 / 7 * $scale);
                    $wmax = min($wmax, 35 * $scale);
                    if ($gen === 0) {
                        $wmax = min($wmax, 17 * $scale);
                    }
                    $text = $this->splitAlignText($text, (int) $wmax);

                    // text angle
                    $tangle = 270 - ($deg1 + $angle / 2);
                    if ($gen === 0) {
                        $tangle = 0;
                    }

                    // calculate text position
                    $deg = $deg1 + 0.44;
                    if ($deg2 - $deg1 > 40) {
                        $deg = $deg1 + ($deg2 - $deg1) / 11;
                    }
                    if ($deg2 - $deg1 > 80) {
                        $deg = $deg1 + ($deg2 - $deg1) / 7;
                    }
                    if ($deg2 - $deg1 > 140) {
                        $deg = $deg1 + ($deg2 - $deg1) / 4;
                    }
                    if ($gen === 0) {
                        $deg = 180;
                    }
                    $rad = deg2rad($deg);
                    $mr  = ($rx - $rw / 4) / 2;
                    if ($gen > 0 && $deg2 - $deg1 > 80) {
                        $mr = $rx / 2;
                    }
                    $tx = $cx + $mr * cos($rad);
                    $ty = $cy + $mr * sin($rad);
                    if ($sosa === 1) {
                        $ty -= $mr / 2;
                    }

                    // print text
                    imagettftext(
                        $image,
                        7,
                        $tangle,
                        (int) $tx,
                        (int) $ty,
                        $foreground,
                        Webtrees::ROOT_DIR . 'resources/fonts/DejaVuSans.ttf',
                        $text
                    );

                    $areas .= '<area shape="poly" coords="';
                    // plot upper points
                    $mr  = $rx / 2;
                    $deg = $deg1;
                    while ($deg <= $deg2) {
                        $rad   = deg2rad($deg);
                        $tx    = round($cx + $mr * cos($rad));
                        $ty    = round($cy + $mr * sin($rad));
                        $areas .= "$tx,$ty,";
                        $deg   += ($deg2 - $deg1) / 6;
                    }
                    // plot lower points
                    $mr  = ($rx - $rw) / 2;
                    $deg = $deg2;
                    while ($deg >= $deg1) {
                        $rad   = deg2rad($deg);
                        $tx    = round($cx + $mr * cos($rad));
                        $ty    = round($cy + $mr * sin($rad));
                        $areas .= "$tx,$ty,";
                        $deg   -= ($deg2 - $deg1) / 6;
                    }
                    // join first point
                    $mr    = $rx / 2;
                    $deg   = $deg1;
                    $rad   = deg2rad($deg);
                    $tx    = round($cx + $mr * cos($rad));
                    $ty    = round($cy + $mr * sin($rad));
                    $areas .= "$tx,$ty";
                    // add action url
                    $areas .= '" href="#' . $person->xref() . '"';
                    $html  .= '<div id="' . $person->xref() . '" class="fan_chart_menu">';
                    $html  .= '<div class="person_box"><div class="details1">';
                    $html  .= '<div class="charts">';
                    $html  .= '<a href="' . e($person->url()) . '" class="dropdown-item">' . $name . '</a>';
                    foreach ($theme->individualBoxMenu($person) as $menu) {
                        $html .= '<a href="' . e($menu->getLink()) . '" class="dropdown-item p-1 ' . e($menu->getClass()) . '">' . $menu->getLabel() . '</a>';
                    }
                    $html  .= '</div>';
                    $html  .= '</div></div>';
                    $html  .= '</div>';
                    $areas .= ' alt="' . strip_tags($person->fullName()) . '" title="' . strip_tags($person->fullName()) . '">';
                }
                $deg1 -= $angle;
                $deg2 -= $angle;
                $sosa--;
            }
            $rx -= $rw;
            $gen--;
        }

        ob_start();
        imagepng($image);
        imagedestroy($image);
        $png = ob_get_clean();

        return response(view('modules/fanchart/chart', [
            'fanh'  => $fanh,
            'fanw'  => $fanw,
            'html'  => $html,
            'areas' => $areas,
            'png'   => $png,
            'title' => $this->chartTitle($individual),
        ]));
    }

    /**
     * split and center text by lines
     *
     * @param string $data   input string
     * @param int    $maxlen max length of each line
     *
     * @return string $text output string
     */
    protected function splitAlignText(string $data, int $maxlen): string
    {
        $RTLOrd = [
            215,
            216,
            217,
            218,
            219,
        ];

        $lines = explode("\n", $data);
        // more than 1 line : recursive calls
        if (count($lines) > 1) {
            $text = '';
            foreach ($lines as $line) {
                $text .= $this->splitAlignText($line, $maxlen) . "\n";
            }

            return $text;
        }
        // process current line word by word
        $split = explode(' ', $data);
        $text  = '';
        $line  = '';

        // do not split hebrew line
        $found = false;
        foreach ($RTLOrd as $ord) {
            if (strpos($data, chr($ord)) !== false) {
                $found = true;
            }
        }
        if ($found) {
            $line = $data;
        } else {
            foreach ($split as $word) {
                $len  = strlen($line);
                $wlen = strlen($word);
                if (($len + $wlen) < $maxlen) {
                    if ($line !== '') {
                        $line .= ' ';
                    }
                    $line .= $word;
                } else {
                    $p = max(0, (int) (($maxlen - $len) / 2));
                    if ($line !== '') {
                        $line = str_repeat(' ', $p) . $line; // center alignment using spaces
                        $text .= $line . "\n";
                    }
                    $line = $word;
                }
            }
        }
        // last line
        if ($line !== '') {
            $len = strlen($line);
            if (in_array(ord($line[0]), $RTLOrd, true)) {
                $len /= 2;
            }
            $p    = max(0, (int) (($maxlen - $len) / 2));
            $line = str_repeat(' ', $p) . $line; // center alignment using spaces
            $text .= $line;
        }

        return $text;
    }

    /**
     * Convert a CSS color into a GD color.
     *
     * @param resource $image
     * @param string   $css_color
     *
     * @return int
     */
    protected function imageColor($image, string $css_color): int
    {
        return imagecolorallocate(
            $image,
            (int) hexdec(substr($css_color, 0, 2)),
            (int) hexdec(substr($css_color, 2, 2)),
            (int) hexdec(substr($css_color, 4, 2))
        );
    }

    /**
     * This chart can display its output in a number of styles
     *
     * @return array
     */
    protected function styles(): array
    {
        return [
            /* I18N: layout option for the fan chart */
            self::STYLE_HALF_CIRCLE          => I18N::translate('half circle'),
            /* I18N: layout option for the fan chart */
            self::STYLE_THREE_QUARTER_CIRCLE => I18N::translate('three-quarter circle'),
            /* I18N: layout option for the fan chart */
            self::STYLE_FULL_CIRCLE          => I18N::translate('full circle'),
        ];
    }
}